Jason M.wrote a review of La Sportiva Karakorum Mountaineering Boot - Men's on December 19, 2016
Familiarity: I've put it through the wringer
Fit: True to size
I use these boots for backcountry hunting in western Wyoming. Heavy loads, off trail hiking, and difficult conditions are the norm. I feel the Karakorum offers a great middle ground between burly, full shank mountaineering boots that are too stiff to hike in and regular hiking or backpacking boots that are not supportive enough. The Karakorum's are stout without being too stout. Stiff enough to hike uphill off trail but not so stiff that I walk like Frankenstein on the trail. I feel the fit is great, nice and snug and supportive without being restrictive. I do not experience any heel lift and the toe box has enough room for my toes to behave normally. Boot fit is a personal thing, however, and these are simply my experiences.
The boots have a significant amount of padding that seems to have an insulative quality. For me, this is good, as I'm typically out in colder temps with the boots. I haven't noticed any overheating when using them in late august and september, though.
As far as waterproofness goes, I did manage to wet out the boots after a couple days of early season wet snow. I treated them with obenaufs afterwards but haven't been out in the same conditions since. Another point of concern is the synthetic ankle portion of the boots. This area drops low in the achilles area of the foot and is an access point for water or snow. If I expect to be out in wet or snowy conditions with these boots, I'll wear gaiter for the extra protection. I'm not sure if a gore tex version of this boot would change my opinion of it, but I am typically a fan of gore tex boots and typically prefer a fully waterproof boot.
Lastly, I'm not a fan of the lacing system. The nylon loops where the yellow stitching is in the picture above do nothing in my experience and I would prefer for them to be farther out on the boot instead of close together on the tongue. Also, the locking d rings right below the nylon loops are a pain. I appreciate the ability to separate the tension of the laces below and above the ankle but the devices used in these boots are difficult to use. Hopefully sportiva figures out a better system.
Overall, a great boot that proves that hunters don't need to rely on traditional hunting names for their gear.